CVE-2021-31545 : What You Need to Know
Discover the impact of CVE-2021-31545, a vulnerability in MediaWiki's AbuseFilter extension through version 1.35.2 leading to exposure of deleted usernames.
An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. The page_recent_contributors leaked the existence of certain deleted MediaWiki usernames, related to rev_deleted.
Understanding CVE-2021-31545
This CVE identifies a vulnerability in the AbuseFilter extension for MediaWiki which can lead to the exposure of deleted usernames.
What is CVE-2021-31545?
CVE-2021-31545 is a security flaw found in MediaWiki's AbuseFilter extension, specifically versions up to 1.35.2. It allows the disclosure of deleted usernames associated with the rev_deleted function.
The Impact of CVE-2021-31545
The impact of this vulnerability is that sensitive information regarding deleted user accounts can be exposed, potentially leading to privacy violations and security risks.
Technical Details of CVE-2021-31545
This section covers the technical aspects of the CVE.
Vulnerability Description
The vulnerability in the AbuseFilter extension of MediaWiki through version 1.35.2 allows the page_recent_contributors to inadvertently reveal certain deleted MediaWiki usernames linked to rev_deleted.
Affected Systems and Versions
All instances of MediaWiki running versions up to 1.35.2 with the AbuseFilter extension are affected by this vulnerability.
Exploitation Mechanism
By leveraging the page_recent_contributors functionality, attackers can retrieve information about deleted usernames through the exposed rev_deleted connection.
Mitigation and Prevention
Protecting against CVE-2021-31545 is essential to safeguard user data and system integrity.
Immediate Steps to Take
MediaWiki administrators should update the AbuseFilter extension to a patched version that addresses this vulnerability. Additionally, review access controls to restrict exposure of sensitive user information.
Long-Term Security Practices
Implement regular security audits and monitoring to detect any unauthorized access or suspicious activity that may exploit similar vulnerabilities.
Patching and Updates
Stay informed about security updates released by MediaWiki and apply patches promptly to mitigate the risk of such vulnerabilities being exploited.